Producing ammonium sulfate.



. niodifi utions showing how this reaction can said specifi ations of CARE BOSCH, OF LUD'QVIGSHAFETLGN-THE-RHINE, GERT-EANY. ASSIGNOR T BHDISCHE TERUDUCIH G la 6; $52332 FABRIK, Q1 LUDWI IiSHAFEN-GN-THE-B 'INE, GERMANY, Ii COR-- 01-1 IUM SULFATE.

i. new

No Drawing.

. Specification. of Letters Patent.

Patented Aug. iii, ioi i.

fspplicatiun filed April 18', 1913. Serial. No. 762,376.

To 11/ "rm 1.12m. it mo (kWh 771:

lie it known that l', CARL Boson. Ph. 1)., Hum citizen of thc German Empire. re-

.."iliug at inulu'igsha'lcn-on-the-lihine, tier uuuav. have invented. new and usclnl linproremcuts in Producing Ammonium Sol o, of which the following a specifics, 'tion..

it has been l=;nown-since 188G that a. soluli-ou amu'ioniuiu hisulfitc. when heated in a sealed 'lass tube. to a temperature of about 1530" Q, is con erted. into sulfate of mumonia, sul. and sulfuric acid zwiwi'z 13, $232.). The specifications of Patent n1). lam-5.007 and of application for parent Herial )io ii -3,281 describe particular be carried out on a manufacturinq' scale, one of the; processes depending on the presence 3 c: "alyst during the reaction. In carrylug out the ahove reactions, if concentrated solutions of his-ulfite are employed, a part 01"" miNll 39. all-LU @150 'glllil Dissolved. (1 Ga The process ol' tlie present invention posscsscs the fur-the advantage that, after removing the annuonium sulfate, 21 concentrated solution of ammoniul'n bisulfii-e is ohl taiucd. and this solution can he immediately cmploycd for further com'ersion into our moniuui sulfate by the application of heat either in the presence, or abscnce of a cata: had as described. for instance in the speci- 'm(l l Dissolved. a

I l i Disso 'lhe presence oi ammonium sulfite oftenl oii'crs advantages 21%; described in the aforepaientfhlo. 1.063.007 l and application l-icrial No. 743.281. For inscam-c. if a soluiiiou of ammonium bisulfitc be. heated hv itself sonic sulfuric acid isl fol-mod. ivhcroar; ii in. addition, some aurl moniiuu militc be present it helps to {ii-l the f rmation of tree sulfuric acid, and reaction can he iii-might About as repl 1M. '1 :ho cipuition 1 the ammonium sulfate crystallizes out, especiall if the free sulfuric acid foru'ied be neutralized, and the other part of the'amnionium. sulfate contained in the mother liquor could only be obtained by evaporation. 1 have found, however, that the ex pensive. operation of evaporating canbe avoided if the ammonium sulfate liquor,

either directly or after removing. that part I of the ammonlum-sulfate Which iscrystah lined out, be treated with ammonia and with sulf'rurous acid, or with ammonium lusulfite, which for the purposes of this invention is equivalent to ammonia and sulfurous acid,

so that the said mother liquor is almost orcompletely saturated with bisuliite. In this casc a iarge separation of the ammonium sulfate is caused to take .place from the liquor and it can he removed therefrom. The reaction. which takes place may be represented by the following equation Dissolved.

fications of Patent No. 1,063,007 and of application Serial No. 743,281.

if desired, in addition to the ammonium bisulfitc which is-employed according to this invention, some ammonium sulfite may be employed Without departing from the nature of the invention. The reaction which then takes place may be IQPIOSGHLQG by the dollowing equation:

Dissolved. Dissolved.

. and

sulfate in the solid form by suitably heating a solution of ammonium bisulfite and then adding ammonia and sulfurous acid to the solution of the ammonium sulfate thus obta fined.

4. The process of producing ammonium sulfate in the solid form by suitably heating a solution containing ammonium bisulfite and ammonium sulfite, and then adding aminonia and sulfurous acid to the solution of ammonium sulfate thus obtained.

5. "he process of producing ammonium sulfate in the solid form by suitably heating a solution of ammonium bisulfite and then adding, ammonia and sulfurous acid to the solution of ammonium sulfate thus obtained, then so aratingthe solid ammonium sulfate from t e liquid portion and subjecting the separated-liquid portion to suitable heating for the production of further ammonium sulfate.

6. Tha -process of 7. The process of producing ammonium sulfate in the solid form by suitably heating a solution of ammonium bisulfite and then adding ammonia and sulfurous acid to the solution of ammonium sulfate thus obtained then separating the solid ammonium sulfate from the liquid portion and subjecting the separated liquid portion to suitable heating ammouiun'i sulfate.

8. The process of producing ammonium sulfate in the solid form by suitably heating a solution containing ammonium bisulfite and ammonium sullitc, and then adding amammonium sulfate thus obtained, arating the solid ammonium sulfate from the liquid portion and subjecting the arated liquid portion to suitable heating with a catalyst for the production of furproducing ammonium ther ammonium sulfate. b In testimony whereof Ihave hereunto set a. solution containing my hand in the presence of two subscribing witnesses.

CARL BOSCH.

arating the sol d ammonium sulfate from t 0 liquid portion and subjecting the sep- .Witnesses:

aratedliquld portion to suitable heat in for J. Anne. LLorn, the production of further ammonium su fate.

Josurn PFEIFFEIL' 

